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diff --git a/src/format.h b/src/format.h
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+/* Format strings.
+   Copyright (C) 2001 Free Software Foundation, Inc.
+   Written by Bruno Haible <haible@clisp.cons.org>, 2001.
+
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 2, or (at your option)
+   any later version.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program; if not, write to the Free Software Foundation,
+   Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */
+
+#ifndef _FORMAT_H
+#define _FORMAT_H
+
+#include "pos.h"	/* Get lex_pos_ty.  */
+#include "message.h"	/* Get NFORMATS.  */
+
+/* This structure describes a format string parser for a language.  */
+struct formatstring_parser
+{
+  /* Parse the given string as a format string.
+     Return a freshly allocated structure describing
+       1. the argument types/names needed for the format string,
+       2. the total number of format directives.
+     Return NULL if the string is not a valid format string.  */
+  void * (*parse) (const char *string);
+
+  /* Free a format string descriptor, returned by parse().  */
+  void (*free) (void *descr);
+
+  /* Return the number of format directives.
+     A string that can be output literally has 0 format directives.  */
+  int (*get_number_of_directives) (void *descr);
+
+  /* Verify that the argument types/names in msgid_descr and those in
+     msgstr_descr are the same.  If not, signal an error using
+       error_with_progname = false;
+       error_at_line (0, 0, pos->file_name, pos->line_number, ...);
+       error_with_progname = true;
+     and return true.  Otherwise return false.  */
+  bool (*check) (const lex_pos_ty *pos, void *msgid_descr, void *msgstr_descr);
+};
+
+/* Format string parsers, each defined in its own file.  */
+extern struct formatstring_parser formatstring_c;
+extern struct formatstring_parser formatstring_python;
+extern struct formatstring_parser formatstring_lisp;
+extern struct formatstring_parser formatstring_java;
+extern struct formatstring_parser formatstring_ycp;
+
+/* Table of all format string parsers.  */
+extern struct formatstring_parser *formatstring_parsers[NFORMATS];
+
+#endif /* _FORMAT_H */